Amplification of a radially polarised beam in an Yb:YAG thin-slab
Amplification of a radially polarised beam in an Yb:YAG thin-slab
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Yb:YAG 薄板中径向偏振光束的放大
DOI：
10.1007/s00340-017-6802-z
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
W. Clarkson
中科院分区：
文献类型：
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作者：
C. Smith;S. Beecher;J. Mackenzie;W. Clarkson
研究人员对使用 Yb:YAG 薄板结构放大 1030 nm 径向偏振光束进行了研究，结果表明这是一种很有前景的功率缩放途径。考虑了古伊相移对径向偏振纯度的不利影响，并提出了一种有效相移管理以恢复偏振纯度的简单方案。基于双通放大器配置的初步实验产生了具有 15 dB 的高径向偏振消光比的输出光束，尽管放大器增益介质非轴对称，但偏振纯度没有下降。在发射泵浦功率为 50 W 时，25 mW 输入获得了 7.5 dB 的小信号增益，而 1.45 W 输入获得了 4.4 dB 增益。讨论了进一步功率扩展的前景。
The use of an Yb:YAG thin-slab architecture for amplification of a radially polarised beam at 1030 nm is investigated and shown to be a promising route for power scaling. The detrimental impact of the Gouy phase shift on radial polarisation purity is considered and a simple scheme for effective phase shift management to restore polarisation purity is presented. Preliminary experiments based on a double-pass amplifier configuration yielded an output beam with a high radial polarisation extinction ratio of 15 dB and no degradation in polarisation purity despite the non- axial symmetry of amplifier gain medium. At 50 W of launched pump power a small-signal gain of 7.5 dB was obtained for a 25 mW input, whilst 4.4 dB gain was obtained for a 1.45 W input. The prospects for further power scaling are discussed.